US-12627354-B2 - Beam indication method and apparatus, and terminal

Abstract

This application relates to the communication field, and in particular, to a beam indication method and apparatus, and a terminal. The method includes: obtaining a unified TCI state pool, where the unified TCI state pool is used for a separate TCI state pool or a joint TCI state pool; and performing separate or joint TCI state indication based on the unified TCI state pool.

Inventors

• Tie Li
• Yongping Zhang
• Xiaoqing Liu
• Zheng Yu
• Xi Zhang

Assignees

• HUAWEI TECHNOLOGIES CO., LTD.

Dates

Publication Date

20260512

Application Date

20230714

Claims (20)

1. 1 . A method, comprising: obtaining an indication field of radio resource control (RRC), wherein the indication field indicates joint indication or separate indication for transmission configuration indication (TCI) states; based on the indication field, satisfying: obtaining a first resource pool configured by a physical downlink shared channel configuration (PDSCH-Config) information element, wherein, when the indication field indicates the joint indication for TCI states, the first resource pool is for TCI state joint indication; or obtaining an uplink TCI state pool configured by an uplink (UL)-bandwidth part (BWP) information element and the first resource pool configured by the PDSCH-Config information element, wherein, when the indication field indicates the separate indication for TCI states, the uplink TCI state pool is for uplink TCI state indication, and the first resource pool is for downlink TCI state indication.
2. 2 . The method according to claim 1 , wherein a first size of the first resource pool is 128, and a second size of the uplink TCI state pool is 64.
3. 3 . The method according to claim 1 , wherein the method further comprises: based on the TCI states being separately indicated, obtaining at least one indication field of a media access control (MAC)-control element (CE) indicating: that there is an uplink TCI state and a downlink TCI state, or that there is an uplink TCI state ID and a downlink TCI state ID.
4. 4 . The method according to claim 3 , wherein the MAC-CE further comprises two BWP ID indication fields, a first BWP ID indication field of the two BWP ID indication fields indicates an uplink BWP, and a second BWP ID indication field of the two BWP ID indication fields indicates a downlink BWP.
5. 5 . The method according to claim 1 , wherein the method further comprises: based on the TCI states being separately indicated: obtaining at least one indication field of a MAC-CE indicating: that there is only an uplink TCI state, or that there is only a downlink TCI state; or obtaining at least one indication field of the MAC-CE indicating: that there is only an uplink TCI state ID, or that there is only a downlink TCI state ID.
6. 6 . The method according to claim 5 , wherein the MAC-CE further comprises two BWP ID indication fields, a first BWP ID indication field of the two BWP ID indication fields indicates an uplink BWP, and a second BWP ID indication field of the two BWP ID indication fields indicates a downlink BWP.
7. 7 . The method according to claim 1 , wherein the method further comprises: based on the TCI states being jointly indicated, obtaining at least one indication field of a MAC-CE indicating that there is a same TCI state for an uplink TCI state and a downlink TCI state.
8. 8 . The method according to claim 7 , wherein the MAC-CE further comprises two BWP ID indication fields, a first BWP ID indication field of the two BWP ID indication fields indicates an uplink BWP, and a second BWP ID indication field of the two BWP ID indication fields indicates a downlink BWP.
9. 9 . The method according to claim 7 , wherein the MAC-CE further comprises a BWP ID indication field, and the BWP ID indication field indicates a same BWP for the uplink TCI state and the downlink TCI state.
10. 10 . The method according to claim 1 , wherein the TCI states are separately or jointly indicated in one or more dimensions, and wherein the one or more dimensions comprise at least one of: a plurality of carriers, a plurality of target signals or channels, a plurality of target transmission directions, or a plurality of terminals.
11. 11 . The method according to claim 1 , wherein, based on the TCI states being jointly indicated, an uplink power control parameter is configured in a TCI state in the first resource pool, or wherein, based on the TCI states being separately indicated, the uplink power control parameter is configured in an uplink TCI state in the uplink TCI state pool.
12. 12 . An apparatus, comprising: at least one processor, and one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor to perform operations comprising: obtaining an indication field of radio resource control (RRC), wherein the indication field indicates joint indication or separate indication for transmission configuration indication (TCI) states; based on the indication field, satisfying: obtaining a first resource pool configured by a physical downlink shared channel configuration (PDSCH-Config) information element, wherein, when the indication field indicates the joint indication for TCI states, the first resource pool is for TCI state joint indication; or obtaining an uplink TCI state pool configured by an uplink (UL)-bandwidth part (BWP) information element and the first resource pool configured by the PDSCH-Config information element, wherein, when the indication field indicates the separate indication for TCI states, the uplink TCI state pool is for uplink TCI state indication and the first resource pool is for downlink TCI state indication.
13. 13 . The apparatus according to claim 12 , wherein a first size of the first resource pool is 128, and a second size of the uplink TCI state pool is 64.
14. 14 . The apparatus according to claim 12 , the operations further comprise: based on the TCI states being separately indicated, obtaining at least one indication field of a media access control (MAC)-control element (CE) indicating: that there is an uplink TCI state and a downlink TCI state, or that there is an uplink TCI state ID and a downlink TCI state ID.
15. 15 . The apparatus according to claim 14 , wherein the MAC-CE further comprises two BWP ID indication fields, a first BWP ID indication field of the two BWP ID indication fields indicates an uplink BWP, and a second BWP ID indication field of the two BWP ID indication fields indicates a downlink BWP.
16. 16 . The apparatus according to claim 12 , wherein the operations further comprise: based on the TCI states being separately indicated: obtaining at least one indication field of a MAC-CE indicating: that there is only an uplink TCI state, or that there is only a downlink TCI state; or obtaining at least one indication field of the MAC-CE indicating: that there is only an uplink TCI state ID, or that there is only a downlink TCI state ID.
17. 17 . The apparatus according to claim 16 , wherein the MAC-CE further comprises two BWP ID indication fields, a first BWP ID indication field of the two BWP ID indication fields indicates an uplink BWP, and a second BWP ID indication field of the two BWP ID indication fields indicates a downlink BWP.
18. 18 . The apparatus according to claim 12 , wherein the operations further comprise: based on the TCI states being jointly indicated, obtaining at least one indication field of a MAC-CE indicating that there is a same TCI state for an uplink TCI state and a downlink TCI state.
19. 19 . The apparatus according to claim 18 , wherein the MAC-CE further comprises two BWP ID indication fields, a first BWP ID indication field of the two BWP ID indication fields indicates an uplink BWP, and a second BWP ID indication field of the two BWP ID indication fields indicates a downlink BWP.
20. 20 . The apparatus according to claim 18 , wherein the MAC-CE further comprises a BWP ID indication field, and the BWP ID indication field indicates a same BWP for the uplink TCI state and the downlink TCI state.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of International Application No. PCT/CN2021/072289, filed on Jan. 15, 2021, the disclosure of which is hereby incorporated by reference in its entirety. TECHNICAL FIELD This application relates to the field of communication technologies, and in particular, to a beam indication method and apparatus, and a terminal. BACKGROUND To meet requirements of three scenarios, compared with 4G LTE (Long Term Evolution) that uses a low frequency band, 5G NR (New Radio) uses a newly added high frequency band (usually considered to be 6G or later), for example, a 28 GHz, 39 GHz, or 60 GHz frequency band. A higher bandwidth and a higher transmission rate are achieved by introducing a high frequency. Because the frequency is high, a signal may severely fade during propagation in space. Therefore, 5G NR uses a BF (beamforming) technology to obtain a good directional gain, so that directional power in a transmit direction is increased, an SINR (signal to interference plus noise ratio) at a receiving end is improved, and system performance is improved. In a 5G NR research process, a tradeoff between costs and performance is considered, and an HBF (hybrid beamforming) technology including digital beamforming and analog beamforming is finally used. In an implementation process of the beamforming technology, an antenna panel is a core component, and a beam is sent or received through the antenna panel. In 5G NR deployment and implementation, a directional beam is used. To meet wide-area coverage, a base station and a terminal are both deployed using a plurality of antenna panels. Especially, for the terminal, to meet coverage and in a case of limited space and cost saving, antenna panel deployment has more important impact on performance. Because both of the base station and the terminal use the hybrid beamforming technology, a transmit beam and receive beam management problem consequently caused becomes a central problem in a 5G NR standardization discussion process. After a plurality of times of discussion, beam management content is standardized, and a beam management framework is further standardized, including beam training, beam measurement and reporting, beam indication that is for signals or channels, and the like. However, currently, there is still no better optimization solution for how to reduce signaling overheads and a delay of the beam indication. SUMMARY Embodiments of this application provide a beam indication method and apparatus, and a terminal, to implement separate and joint TCI state pools and separate and joint TCI state activation or indication by using a loose TCI state pool design, so that signaling overheads and a delay of beam indication are reduced. A loose TCI state pool is applicable to both separate activation or indication and joint activation or indication. One TCI state pool may be used for uplink or downlink, or may be used for uplink and downlink. According to a first aspect, an embodiment of this application provides a beam indication method, including: obtaining a unified transmission configuration indication TCI state pool, where the unified TCI state pool is used for a separate TCI state pool or a joint TCI state pool; andperforming separate or joint TCI state indication based on the unified TCI state pool. In other words, in this method, the separate or joint TCI state indication may be performed based on the unified TCI state pool. The unified TCI state pool refers to a loose TCI state pool, which is applicable to both separate indication and joint indication. One TCI state pool may be used for uplink or downlink, or may be used for uplink and downlink. TCI may represent a plurality of types of QCI relations. The TCI state pool may be represented as at least a beam pool. In a possible implementation, the unified TCI state pool includes a first-part resource pool and a second-part resource pool; when the unified TCI state pool is used for the joint TCI state pool, at least one of the following is included:the first-part resource pool is the joint TCI state pool, and the first-part resource pool is used for downlink TCI state indication or activation, and uplink TCI state indication or activation;the second-part resource pool is the joint TCI state pool, and the second-part resource pool is used for downlink TCI state indication or activation, and uplink TCI state indication or activation; orthe first-part resource pool and the second-part resource pool are the joint TCI state pool, and the first-part resource pool and the second-part resource pool are used for downlink TCI state indication or activation, and uplink TCI state indication or activation; andwhen the unified TCI state pool is used for the separate TCI state pool, the first-part resource pool is used for downlink TCI state indication or activation; and the second-part resource pool is or the first-part resource pool and the second-part resource pool are u